CVE-2023-27537

moderate-risk
Published 2023-03-30

A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.

Do I need to act?

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0.08% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (11)

Affected Vendors

Broadcom Haxx Netapp Splunk

References (6)

Exploit https://hackerone.com/reports/1897203
Third Party Advisory https://security.gentoo.org/glsa/202310-12
Third Party Advisory https://security.netapp.com/advisory/ntap-20230420-0010/
Exploit https://hackerone.com/reports/1897203
Third Party Advisory https://security.gentoo.org/glsa/202310-12
Third Party Advisory https://security.netapp.com/advisory/ntap-20230420-0010/
34
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 16/34 · Moderate